<template>
  <div>
    <div v-for="(item,index) in arr" :key="index" style="display: inline-block">
      <input type="checkbox" v-model="arrBox" :value="item">
      <span>{{item}}</span>
    </div>
    <p>你选中的元素，累加的值得和为：{{theSum}}</p>
  </div>
</template>

<script>
export default {
  data () {
    return {
      arr:[9, 15, 19, 25, 29, 31, 48, 57, 62, 79, 87],    
      arrBox:[]  
    }
  },
  computed: {
    theSum() {
      return this.arrBox.reduce((sum, val) => {
        return (sum += val);
      }, 0);
    },
  },
}
</script>

<style>

</style>